This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 40 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 40 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A wasp sting is alkali. Which substance would neutralise the sting? A) Vinegar. B) Bleach. C) Baking soda. D) Distilled water. Show Answer Correct Answer: A) Vinegar. 2. A wasp sting is alkaline (pH 9). What could be used to treat a wasp sting??? A) Acidic. B) Basic. C) Neutral. D) Salt. Show Answer Correct Answer: A) Acidic. 3. Which pH value indicates the most basic solution? A) 7. B) 8. C) 3. D) 11. Show Answer Correct Answer: D) 11. 4. The colour of methyl orange indicator in acidic medium is ..... A) Yellow. B) Red. C) Green. D) Orange. Show Answer Correct Answer: B) Red. 5. The molecular formula of pentanoic acid is A) C$_{5}$H$_{11}$O$_{2}$. B) C$_{5}$H$_{9}$O$_{2 }$. C) C$_{5}$H$_{10}$O$_{2}$. D) C$_{5}$H$_{12}$O$_{2}$. Show Answer Correct Answer: C) C$_{5}$H$_{10}$O$_{2}$. 6. Ethanol reacts with ethanoic acid to form ethyl ethanoate.C$_{2}$H$_{5}$OH + CH$_{3}$COOH $\rightarrow$ CH$_{3}$COOC$_{2}$H$_{5}$ + H$_{2}$OWhat is the formula of the ester formed when methanol reacts with butanoic acid, (C$_{3}$H$_{7}$COOH)? A) C$_{2}$H$_{5}$COOC$_{2}$H$_{5}$. B) C$_{3}$H$_{7}$COOC$_{2}$H$_{5}$. C) C$_{3}$H$_{7}$COOCH$_{3}$. D) CH$_{3}$COOC$_{3}$H$_{7}$. Show Answer Correct Answer: C) C$_{3}$H$_{7}$COOCH$_{3}$. 7. What prefix is used to name binary acids? A) Per-. B) Hydro-. C) Hypo-. D) Bi-. Show Answer Correct Answer: B) Hydro-. 8. BASE + ACID $\rightarrow$ SALT +? A) Water. B) Oxygen. C) Hydrogen ion. D) Hydroxide ion. Show Answer Correct Answer: A) Water. 9. Which base is called lime water A) Magnesium hydroxide. B) Sodium hydroxide. C) Ammonium hydroxide. D) Calcium hydroxide. Show Answer Correct Answer: D) Calcium hydroxide. 10. Which of the following acids are not stored in Metal Containers? A) Hydroflouric Acids. B) Hydrochloric Acids. C) Sulphuric Acids. D) All the Acids. Show Answer Correct Answer: D) All the Acids. 11. Which type of ion does a base produce when it is dissolved in water? A) Oxide. B) Oxygen. C) Hydrogen. D) Hydroxide. Show Answer Correct Answer: D) Hydroxide. 12. What is the pH of a neutral substance? A) 0. B) 5. C) 7. D) 10. Show Answer Correct Answer: C) 7. 13. What does a pH of 1 indicate about a liquid? A) It is a very strong base. B) It is a weak base. C) It is a weak acid. D) It is a strong acid. Show Answer Correct Answer: D) It is a strong acid. 14. Which property do bases have? A) Sour taste. B) React with metal. C) Slippery. D) None of the above. Show Answer Correct Answer: C) Slippery. 15. How is water formed in the Neutralization reaction? A) From the H$^{+}$ of acid and OH$^{-}$ of acid. B) From the H$^{+ }$ of base and OH$^{-}$ of acid. C) From the H$^{+}$ of acid and OH$^{-}$ of base. D) From the H$^{+}$ of base and OH$^{-}$ of base. Show Answer Correct Answer: C) From the H$^{+}$ of acid and OH$^{-}$ of base. 16. Universal indicator in a reaction of adequate amount of acid and base, A) Red. B) Purple blue. C) Green. D) Orange. Show Answer Correct Answer: C) Green. 17. A student tests an unknown aqueous solution and finds it conducts electricity and turns litmus paper red. What can the student infer? A) The solution contains an acid. B) The solution contains a base. C) The solutions is neutral. D) None of the above. Show Answer Correct Answer: A) The solution contains an acid. 18. A ..... is formed when an positive ion bonds with a negative ion. A) Acid. B) Base. C) Salt. D) Neutral ion. Show Answer Correct Answer: C) Salt. 19. A Lewis acid is defined a base as being an ..... A) A proton doner. B) A proton acceptor. C) An electron donor. D) An electron acceptor. Show Answer Correct Answer: C) An electron donor. 20. Which of the following is the word equation for the reaction between acids and carbonates? A) Metal + acid $\rightarrow$ salt + hydrogen. B) Carbonate + acid $\rightarrow$ salt + water. C) Carbonate + acid $\rightarrow$salt+ carbon dioxide + hydrogen. D) Base + acid $\rightarrow$ salt + water. Show Answer Correct Answer: C) Carbonate + acid $\rightarrow$salt+ carbon dioxide + hydrogen. 21. What would happen to red litmus paper when it encounters a base? A) It turns blue. B) It stays red. C) It turns purple. D) It turns green. Show Answer Correct Answer: A) It turns blue. 22. On adding acidified silver nitrate to a solution, a white precipitate was formed which turn grey when in sunlight. Which of the following compounds could have been present? A) AgCl. B) NaI. C) NaCl. D) FeCl $ _ {3} $. Show Answer Correct Answer: C) NaCl. 23. What pH is the strongest base? A) 1. B) 7. C) 4. D) 14. Show Answer Correct Answer: D) 14. 24. Releases hydrogen in an aqueous solution. A) Base. B) Strong base. C) Acid. D) Weak base. Show Answer Correct Answer: C) Acid. 25. What is the name of HBr? A) Hydrobromous acid. B) Hydrobromic acid. C) Bromic Acid. D) Bromous Acid. Show Answer Correct Answer: B) Hydrobromic acid. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 7 Science Chapter 4 Acids Quiz 2Class 7 Science Chapter 4 Acids Quiz 3Class 7 Science Chapter 4 Acids Quiz 4Class 7 Science Chapter 4 Acids Quiz 5Class 7 Science Chapter 4 Acids Quiz 6Class 7 Science Chapter 4 Acids Quiz 7Class 7 Science Chapter 4 Acids Quiz 8Class 7 Science Chapter 4 Acids Quiz 9Class 7 Science Chapter 4 Acids Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books